This bridge was designed to connect a road that never came to fruition.

Tubing through a cave lit with glowworms is a magical underground experience.

Walk through abandoned anti-Russian military tunnels on this volcano at the head of Auckland Harbor.

A gigantic sculpture garden is packed with innovative oddities.

Largest Kauri tree in New Zealand.

Mounds of fine golden sand that can rise nearly 500 feet tall.

Watch the seas clash at the place where according to Maori tradition, the spirits depart for their journey to the afterlife.

This remote highway took over 50 years to build.

This mechanical clock performs "Romeo and Juliet" in a Shakespeare-themed New Zealand town.

A peninsula on a peninsula that becomes an island at high tide.

Spectacular rock formations host dinosaur footprints and an old hydrotherapy pool.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

According to myth, there's a bloody explanation for the beautiful bright red color of this rock formation set amidst alpine vegetation.

Extremely isolated Silk Road caravanserai in the middle of nowhere.

An outstanding piece of retro Sci-Fi architecture built into a sacred mountain.

These "50 Fortresses" have been unearthed in the ancient oasis of Khwarezm.

Ancient barriers wrap around what was once an important stop along the Silk Road.

Once a bustling fishing port, this semi-ghost town is now more than 90 miles away from the shore.

The ruins of an ancient Zoroastrian Tower of Silence believed to be the earliest example of the traditional funerary practice.

A fiery crater has been burning in the Karakum Desert since 1971.

A sprawling nature preserve harbors the world's only living dragons.

Where cemeteries are carved into the side of cliffs and infants are buried in the hollows of trees.

The unique funeral practices of the Toraja can be seen here with graves carved into caves and hung off cliffs.

One of the largest caverns in the world has a maw large enough to stack cathedrals in.